Alert archive / Idaho / Flash Flood Warnings in 1986

Flash Flood Warning 1, NWS Spokane, WA

August 29, 1986Clearwater County, Idaho County, Lewis County, Idaho

NWS Spokane, WA issued this flash flood warning at Aug 29, 1986, 4:40 PM PDT for Clearwater County, Idaho County, Lewis County, Idaho. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Aug 29, 1986, 4:40 PM PDT (23:40 UTC)
Expired
Aug 29, 1986, 7:30 PM PDT
In force
3 hr
Issued by
NWS Spokane, WA
Area
Whole counties

Counties Clearwater County, ID, Idaho County, ID, Lewis County, ID

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 11.7 hours before the alert went out and 166 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Spokane, WA at 12:00Z on 1986-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 12:00Z on 1986-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -19 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3604 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
-19 m²/s²
0-3 km storm-relative helicity
20 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KLWS 292343
FFWLWS
IDC061-035-049-300230-

BULLETIN IMMEDIATE BROACAST REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LEWISTON ID
440 PM PDT FRI AUG 29 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
AND FLASH FLOOD WARNING EFFECTIVE UNTIL 730 PM FOR PEOPLE IN THE
FOLLOWING COUNTIES OF

IDAHO...LEWIS...CLEARWATER AND NORTHERN IDAHO

AT 430 PM RADAR AND LIGHTNING DETECTION SOURCES INDICATED A
SEVERE THUNDERSTORM IN LEWIS COUNTY.  THE LEWIS COUNTY SHERIFFS
DEPT REPORTS AN UNCONFIRMED FLASH FLOOD ALONG HIGHWAY 62.
THESE THUNDERSTORMS AR MOVING SLOWLY EASTWARD.

THIS IS A VERY DANGEROUS STORM WITH LIGHTNING.  PEOPLE IN ITS PATH
SHOULD SEEK SHELTER.  DO NOT AT[TEMPT TO CROSS FLOODED AREAS SUCH
AS CREEKS...STREAMS OR OTHER LOW LYING AREAS WHERE FLOOD WATERS
COULD AFFECT.

REPORT ANY FLOODING ARE SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT

AGENCY AND THE NATIONAL WEATHER SERVICE.

END/TURNER

The office that day

Everything else NWS Spokane, WA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 29, 4:40 PM PDTSevere Thunderstorm WarningOTXClearwater, Idaho, Lewis50 min

Nearby

Flash Flood Warnings in Idaho, 1986Every flash flood warning in 1986

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.